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See Chinese contents: GB/T 31883-2015 GB/T 31883-2015: Road vehicles -- Drawbar couplings, drawbar eyes, fifth wheel kingpins, hook couplings and toroidal eyes -- Wear limits for in-use mechanical couplings
This Standard specifies the wear limit size and maximum allowable wear extent of the in-use mechanical coupling; so that ensure the safe running of the heavy-duty vehicle installed with such coupling.
